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**Example:**
::
from botocore.session import Session
s3 = Session().create_client('s3')
response = s3.select_object_content(
Bucket='bucketname',
Key='keyname',
ExpressionType='SQL',
RequestProgress={'Enabled': True},
Expression="SELECT * FROM S3Object s",
InputSerialization={'CSV': {}},
OutputSerialization={'CSV': {}},
)
# This is the event stream in the response
event_stream = response['Payload']
end_event_received = False
with open('output', 'wb') as f:
# Iterate over events in the event stream as they come
for event in event_stream:
# If we received a records event, write the data to a file
if 'Records' in event:
data = event['Records']['Payload']
f.write(data)
# If we received a progress event, print the details
elif 'Progress' in event:
print(event['Progress']['Details'])
# End event indicates that the request finished successfully
elif 'End' in event:
print('Result is complete')
end_event_received = True
if not end_event_received:
raise Exception("End event not received, request incomplete.")
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